Question

Part B??

An l-beam has a flange width b-250 mm , height h = 250 mm , web thickness tw-9 mm , and flange thickness tf = 14 mm . Use the following steps to calculate the shear flow at the point shown, where z = 80 mm Learning Goal: To calculate the shear flow at a point in the flange of an I-beam section subject to a shear force. A thin-walled structure is one where the wall thickness is small compared to its height or width. When a thin-walled beam section is subjected to a shear load, internal shear causes stresses to develop primarily parallel to the wall, The distribution of this shear stress can be described by the shear flow, which is the shear force per unit length parallel to the wall. Figure 2) Part A Moment of inertia The formula for the shear flow includes the moment of inertia of the whole cross section, I, about the neutral axis. Calculate the moment of inertia. VQ Express your answer with appropriate units to three significant figures. g =-. Here V is the The shear flow at a point is given by q shear force on the section and I is the moment of inertia of the section. The value of Q is a bit more complex. For the shear flow at a point, is the moment of the area above the point about the neutral axis (Figure 1). View Available Hint(s) 1= 1.06x 104 cm4 Previous Answers Correct Part B-Q for the given point ▼ The shear flow at the point depends on the value of for the portion of the upper flange to the right of the point. Calculate the value of Q Express your answer with appropriate units to three significant figures. View Available Hint(s) Figure 1 of 2 > Q-Value Units Submit Previous Answers

Answer 1

Draw the cross-section of the diagram as follows: 14 mm 250 mm mm 120 mm 120.5 mm 14 mm 250 mm Calculate the moment of inertia as follows: 7- 250 25092 120.5x(250 – 2x14) 12 12 =1.06x10mm x_1cm Im *10*mm* I =1.06x104 cm Calculate the value of Q for the shaded area as follows: 120 mm 1205 Q = Ay Q=125x14x(125-13) Q = 206500 mm